Combination of builtin Enumerable#inject and splat operator behaves wrong
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Key: JRUBY-2162
URL: http://jira.codehaus.org/browse/JRUBY-2162
Project: JRuby
Issue Type: Bug
Components: Compiler, Core Classes/Modules, Interpreter
Affects Versions: JRuby 1.1RC2
Reporter: Stefan Lang
Short sample: jruby -e '[1].inject(0) { |*args| p args }'
prints: [[0, 1]]
Args are wrapped in an additional array.
More example code: save the follwing code in splat_and_inject.rb:
puts "my_inject"
module Enumerable
def my_inject(init)
acc = init
each { |elem| acc = yield acc, elem }
acc
end
end
# OK
p [1, 2].my_inject(0) { |a, b|
puts "a: #{a.inspect}, b: #{b.inspect}"
a + b
}
# broken, jruby wraps args in an additional array
p [1, 2].my_inject(0) { |*args|
puts "args: #{args.inspect}"
args[0] + args[1]
}
puts "builtin inject"
# OK
p [1, 2].inject(0) { |a, b|
puts "a: #{a.inspect}, b: #{b.inspect}"
a + b
}
# broken, jruby wraps args in an additional array
p [1, 2].inject(0) { |*args|
puts "args: #{args.inspect}"
args[0] + args[1]
}
Output when run with ruby 1.8.6:
$ ruby186 splat_and_inject.rb
my_inject
a: 0, b: 1
a: 1, b: 2
3
args: [0, 1]
args: [1, 2]
3
builtin inject
a: 0, b: 1
a: 1, b: 2
3
args: [0, 1]
args: [1, 2]
3
and with jruby 1.1RC2:
$ jruby splat_and_inject.rb
my_inject
a: 0, b: 1
a: 1, b: 2
3
args: [0, 1]
args: [1, 2]
3
builtin inject
a: 0, b: 1
a: 1, b: 2
3
args: [[0, 1]]
splat_and_inject.rb:32: can't convert nil into Array (TypeError)
from splat_and_inject.rb:32:in `inject'
from splat_and_inject.rb:32:in `each'
from splat_and_inject.rb:32:in `inject'
from splat_and_inject.rb:32
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